Abstract
It is shown that the far-infrared scatter from smooth mirrors can be dominated by the scatter from just a few very small particles or defects. This emphasizes the necessity for good cleaning techniques and good clean-room procedures. Several effects of this finding are discussed, as well as several other related topics: the cleanliness required for the scatter to be dominated by a mirror's surface microroughness; a proposed specification for low-scatter infrared mirrors; incident angle invariance of clean and contaminated mirrors; the shape ofthe bidirectional reflectance distribution function (BRDF) curves; and the relation between surface cleanliness level, clean-room cleanliness class, and BRDF.
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